- JobeTheConqueror
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- Exalted Legendary Member
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Reach was the site of main military development for the UNSC. Most of the military's advancements, testing, and construction took place on Reach. It holds labs and a base under the mountains specifically for developing new infantry weapons. The Spartan Laser was likely among those.
The Pillar of Autumn was also stated to be loaded with experimental weapons during Halo Wars. It's entirely possible that the Spartans were outfitted from that ship, either directly or indirectly. Either way, the Spartans were outfitted on Reach before being sent on their mission.
H3 or any of it's related story content suggest in no way that the Laser is a brand new development. It's simply a newish weapon that took awhile to get around. Which is understandable when the UNSC is in a war that has destroyed 90% of it's people, places, and resources.